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If you need more battery life from your iPhone then there are a number of battery cases available for Apple's latest devices, which serve to provide a boost when you're running low. I recently looked at the crazy Snow Lizard SLXtreme 5 here, which offered an extended battery that could be charged via its USB port or even by an included solar panel. It was also water, dust and shock proof but was also very large. Thankfully, there are a few other options to consider if you just want a battery case or one that will make your iPhone 5S waterproof.

Apple, smartphone and tablet accessory company ibattz was keen to show three of its latest Apple iPhone cases, which are compatible with the iPhone 5 and 5S. The Mojo Refuel, Mojo Refuel Aqua and Mojo Refuel Armour are all based around a single identical iPhone interface, which includes a battery section and Apple Lightning connector along with a headphone cut-out and micro USB charging port.

The party piece of the battery section is that it has a removable battery, which is actually identical to that in the Samsung Galaxy S3. As such, you can purchase additional batteries to take with you on longer trips, or even use a compatible charger to top them up instead of using the Mojo Refuel. As all iPhone's lack this ability, this is very handy indeed, especially as the battery is available for as little as $10 and once it starts to fade - typically after 300-500 charge cycles, you can just replace the battery and not the entire case.

Mojo Refuel

The Mojo Refuel only includes a plastic protective bumper in addition to the battery section, which clips over the iPhone and battery section, creating a fairly sturdy case for your device.

I was particularly pleased with the size of the headphone passthrough - it's large enough to let practically all headphone connectors through. Unlike some cases, the Mojo Refuel gives you access to all the phones buttons and switches directly - there's no overlaid buttons or films here.

The battery section is fairly thin and has a battery level indicator at the rear, with a button on the side that allows you to tap into the battery power on demand. The device automatically switches off the battery power once your iPhone reaches full charge.

The only issue we found with the Mojo Refuel was that the plastic protective bumper was impossible to remove without a small tool although a credit card does work if you need to access the iPhone for whatever reason.

Mojo Refuel Aqua

Unsurprisingly, Mojo Refuel Aqua is the waterproof version of the Mojo Refuel case. It's a little on the large side, being 22mm thick and 145mm long but weighs less than 100g and is far more compact than the SLXtreme 5 I looked at recently.

The battery section, which is identical to that in the standard Mojo Refuel, is sandwiched between a plastic front and rubber backing, with the latter fitting tightly into groves around the front section.